BIOL 1202 Chapter : Biol 1202
Document Summary
Ch 22 descent with modification: a darwinian view of life. We all evolved from common ancestors and changed with varying degrees over time. Evolution: two main ideas: change over time of the genetic composition of a population, decent of modern organisms with modification from preexisting. Accumulation of inherited characteristics that enhance organisms ability to survive in specific environments. Bodies of living organisms are modified through the use or disuse of parts. Cuvier- catastrophism: catastrophes caused extinct species and strata. Darwin and wallace developed the theory independently: darwin- voyage of the beagle (darwin got credit bc his theory was more developed and gave a better explanation of his theory, wallace- british naturalist in indonesia. Finches occupied different parts of the island with different beaks for foraging ( cactus eater, seed eater) The unequal survival and reproduction of organisms due to environmental forces, resulting in the preservation of favorable adaptations. Process selects from what is available in the gene pool.
